Add NATS testcontainers module

[kevinferrare-1a]

Hi!

I'd like to propose adding a NATS module to Testcontainers Java, bringing feature parity with the existing NATS modules available in Go, .NET, Node.js, Python, and Rust:
https://testcontainers.com/modules/nats/

NATS is a messaging system that's widely used in various organizations.

Currently, Java developers using Testcontainers must rely on GenericContainer to test NATS integrations, while developers in other ecosystems have dedicated modules with better developer experience.

I have a PR ready:
#11343